DCG

Adjustment)

PART 1 – GENERAL

1.1 SUMMARY

A. Adjustable round supply diffuser(s) with adjustable core allowing horizontal or vertical discharge by rotating the inner core to move the cone assembly up or down.

B. Suitable for heating, ventilating, and cooling applications with ceiling heights 8.5 ft (2.6 m) and higher, and temperature differential up to 22°F (12°C), unless otherwise indicated.

C. 360° air diffusion pattern; suitable for VAV systems.

D. Construction: heavy-gauge spun aluminum; duct mounted or drywall mounted, as scheduled.

E. Optional plenums (as scheduled): provide optional plenum(s) for air equalization, acoustical performance, limited ceiling space, oversized face with given duct diameter, and/or special damper requirements.

1.2 SUBMITTALS

A. Product Data: Manufacturer’s data for scheduled neck sizes and configurations, including:

1. Free area; recommended minimum and maximum airflow.
2. Pressure loss and diffuser-generated NC.
3. Throw data (as published) for horizontal and/or vertical discharge conditions where applicable.
4. Temperature differential correction factors (where published).
5. Mounting method and accessories.
6. Optional plenum and damper selections (if scheduled).

B. Shop Drawings: Show model designation, neck size, mounting type (duct mounted or drywall mounted), finish/color, and optional plenum selection (PLRR or PLXP) including air equalizing grid option (EQ), where scheduled. Indicate any scheduled damper type (R3G / OBD / RSBD).

C. Airflow Prediction Report (Required): Provide manufacturer-generated room airflow prediction report using manufacturer performance data and recognized correction methods. Report shall include:

1. 3D room layout with diffuser placement.
2. Predicted airflow visualization views: plan (top), section (side), elevation (front).
3. Throw distances for terminal velocities of 150, 100, 60, 50, 40, 30, and 20 fpm.
4. Pressure loss at scheduled airflow.
5. Diffuser-generated NC.
6. Perceived NC: sound pressure at room center (5 ft height) from all sources combined across 63–8000 Hz octave bands; include key assumptions used.

D. Verified CFD Validation (When Indicated): Provide EffectiV Verified CFD validation and summary report for spaces indicated and/or when operation is outside published selection limits.

1.3 SUBSTITUTIONS

A. Substitutions per Division 01. Proposed equals shall provide a line-by-line compliance matrix including all Part 1 deliverables.

PART 2 – PRODUCTS

2.1 BASIS OF DESIGN

A. EffectiV DCG adjustable aluminum round diffuser, manual core adjustment.

2.2 SIZES AND AIRFLOW (AS SCHEDULED)

A. Provide scheduled neck diameter(s) and airflow within published ranges:

1. 6 in (160 mm): 125–240 cfm
2. 8 in (200 mm): 200–390 cfm
3. 10 in (250 mm): 310–470 cfm
4. 12 in (315 mm): 490–950 cfm
5. 14 in (355 mm): 610–1280 cfm
6. 16 in (400 mm): 795–1610 cfm
7. 18 in (450 mm): 920–1560 cfm
8. 20 in (500 mm): 1110–1860 cfm

2.3 MATERIALS AND CONSTRUCTION

A. Diffuser: heavy-gauge spun aluminum construction.

B. Adjustment: core adjustable up/down by rotating inner core to change from horizontal projection to vertical projection.

C. Mounting: duct mounted or drywall mounted, as scheduled.

2.4 FINISH

A. Factory powder coat, TGIC-free, white M9016 unless otherwise scheduled.

2.5 OPTIONAL PLENUMS AND OPTIONS (AS SCHEDULED)

A. PLRR plenum: optional plenum used to equalize air (including EQ air equalizing grid option), to use an oversized face with a given duct diameter, and/or to add a special damper. Plenum shall include anti-seismic tabs.

B. PLXP plenum: optional side-connection plenum used where ceiling space is limited, where acoustical performance is important, and/or to add a special damper.

C. EQ option: air equalizing grid (perforated plate) where scheduled.

2.6 DAMPERS (AS SCHEDULED)

A. Provide damper type as scheduled:

1. R3G integrated butterfly volume damper
2. OBD opposed blade damper
3. RSBD radial sliding blade damper

PART 3 – EXECUTION

3.1 INSTALLATION

A. Install per manufacturer instructions; coordinate duct-mounted versus drywall-mounted installation.

B. Where optional plenum is scheduled, install plenum square/true and attach diffuser per manufacturer method; coordinate anti-seismic tab attachment where applicable.

3.2 ADJUSTING

A. Balance to scheduled airflow.

B. Adjust core position to achieve required discharge mode (horizontal or vertical) consistent with design intent.